Manufacture of polychrome-ornamented glazed or similar ceramic ware.



'menting material, which is either mixed with GEORG VON DEM I-lORNE, OFBORNHOFEN, GERMANY.

MANUFACTURE OF POLYCHROME-ORNAMENTED GLAZED 0R SIMILAR CERAMIC WARE.

SPECIFICATION forming part of Letters Patent No. 685,666, dated October29, 1 901.

Application filed January 14, 1901.

To all whom it may concern:

Be it known that I, Gnone VON DEM BORNE, a subject of the Emperor ofGermany, residing at Bornhofen, near Berneuchen, in the German Empire,have invented new and usef ulImprovements in the Manufacture ofPolychrome-Ornamented Glazed or Similar Oeramic Ware, of which thefollowing is a specification.

This invention relates to improvements in the manufacture ofpolychrome-ornamented glazed or similar ceramic ware.

According to my invention the unburned or biscuit ware is in coatingwith glaze or the like and during the drying treated with a cethe glazebefore application or sprayed or spread upon the glaze after it has beenapplied in the ordinary manner, in order that the said glazing or thelike shall when drying be hardened to a solid body, as it is found thatonly such hardened but not loosely-adhering coatings are acted upon inthe desired manner by the sand-blast. As the hardening materials Iemploy cementing materials in solutions and emulsions-as, for example,solutions of dextrin, gelatin, and glue in water; alcoholic solutions ofshellac, lime, soap, &c.; also water glass; oxychlorids, whichhardeninacement-like manner-as,for example,zinc oxychlorid;hydrosilicates-for example, the hydrosilicate of lime; combinations ofsilicofluoric acid-such, for example, as magnesia silicic fluorid, 850.

The operation may be carried out as follows: Assuming the first coatingof glaze or the like has been applied with the hardening material and itis desired to apply a further coating, a thin sheet of paper is gummedto the surface-of the glaze. After it has dried a stencil of the designto be reproduced is applied to the paper, and the design is then cut bythe action of the sand-blast. The stencil is then removed and the secondcoating of glaze applied, the said glaze only adhering to those partswhere the first coating has been cut away by the sand-blast, theportions of the paper sheet which were left unafiected by the sand-blastbeing softened by the water contained in the second coating of glaze, sothat they can be easily detached. This process may be repeated anydesired number of Serial No. 43,262. (No specimens.)

times. Instead of gumming paper onto the hardened glaze or similarcoating the latter can after the drying operation and before beingsubjected to the first sand-blast be provided with a complete or partialvarnish, wax, or fatty layer which hardens well. This protective layeracts toward the parts not afiected bythe sand-blast in the same way asthe paper layer-that is to say, both as a protection or resist whencoating with a further colored or colorless hardening, glazing, orsimilar layer, as the parts covered with varnish, wax, or fat take theglazing solution no better than those covered with paper. Aftera secondglazing or similar layer has been applied in this manner to certainparts of the article it can after hardening and drying be againsubjected to the sand-blast and the process repeated with furtherlayers, if desired. Furthermore, the whole article can before theglazing is hardened on be coated with a colorless glazing, in which caseit is necessary, should the parts covered with paper or with varnish orfat still be required to take up glazing, to detach or burn off thepaper or to remove the varnish or fat by heating or treating withsolvents. After the articles have in this manner been provided with thede sired colored pattern the glazing is hardened on by burning.

As the ornamentation of the coatings is ef= fected before the operationof hardening on and the repeated-firing is avoided, the present processis a decided advance upon the process hitherto in vogue; but the presentprocess also permits that very different colors, even in the case ofcomplicated contours, can be applied with a sharpness of definitionhitherto impossible-as, for example, in the case of the so-calledMettlacher plates=and it possesses in comparison with the ordinaryprocess the very substantial advantage that the manufacture of thestencils is considerably simpler and cheaper. Furthermore, in

the case of complicated patterns it is possi-' ble to hand over designsto the oven a few hours after the work has been put in hand, andtheprocess enables changing taste to be followed and insures that designsshall be reproduced with a truth hitherto unattainable. The subsequentdeadening of the burned surface in the well-known manner by the sand- 7blast or by etching can be carried out, if desired.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatWhat I claim is 1. The herein described process for the manufacture ofceramic ware, which consists in applying to the unburned or biscuitware, a coating of glaze treated with a hardening material, applying aprotectingcoating to said glaze, removing portions of the glaze andapplying a subsequent coating of glaze which Will be prevented fromadhering to the portions of the first coating covered by theprotecting-coating and hardening the coats of glaze by firing,substantially as described.

2. The herein described process for the manufacture of ceramic Ware,which consists in applying to the unburned or biscuit Ware, a coating ofglaze treated with a hardening material, applying a protecting-coatingto the glaze, removing portions of the protectingcoating and the glazebeneath the same, by means of the sand-blast, applying subsequentcoatings of glaze to the portions of the article from which the glazehas been so removed, removing the remaining portions of theprotecting-coating and hardening the coats of glaze by burning,substantially as described. 3. The process for manufacturing ceramicWare which consists in coating the unburned or biscuit ware with aglaze, treated with a hardening material, applying a protectingcoatingof paper to the coating of glaze, removing portions ot theprotecting-coating and glaze and applyinga subsequent coating of glazeand hardening the coats of glaze by burning, substantially as described.

GEORG v. D. BORNE.

Witnesses:

O. WERNICKE, ZERLIO.

